The Sirsal Bankers are two bankers who run the bank on Lunar Isle. They are two of the only three men on Lunar Isle (the third is the pirate-banker 'Bird's-Eye' Jack). Like the women of the Moon Clan, the two bankers float behind the bank's counter.
Before completing Dream Mentor, players need a Seal of passage to bank with them, and if they try to bank without one, they will be sent off the island, to Rellekka. After completing the quest, players can bank with 'Bird's-Eye' Jack through their dialogue without needing the seal.
This is the closest bank to the Astral altar and is used by players when crafting Astral runes.